Remove all uses of toolkit_use_gtk in the gyp files.

build/common.gypi

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 176 matching lines @@
             'toolkit_views%': 0,
           }],
 
           # Embedded builds use aura without ash or views.
           ['embedded==1', {
             'use_aura%': 1,
             'use_ash%': 0,
             'toolkit_views%': 0,
           }],
 
-          # Set toolkit_uses_gtk for the Chromium browser on Linux.
-          ['desktop_linux==1 and use_aura==0 and use_ozone==0', {
-            'toolkit_uses_gtk%': 1,
-          }, {
-            'toolkit_uses_gtk%': 0,
-          }],
-
           # Enable HiDPI on Mac OS, Chrome OS and Windows.
           ['OS=="mac" or chromeos==1 or OS=="win"', {
             'enable_hidpi%': 1,
           }],
 
           # Enable App Launcher on ChromeOS, Windows and OSX.
           # On Linux, enable App Launcher for the Aura build.
           ['use_ash==1 or OS=="win" or OS=="mac" or (desktop_linux==1 and use_aura==1)', {
             'enable_app_list%': 1,
           }, {
@@ skipping 32 matching lines @@
           }],
         ],
       },
 
       # Copy conditionally-set variables out one scope.
       'chromeos%': '<(chromeos)',
       'host_arch%': '<(host_arch)',
       'target_arch%': '<(target_arch)',
       'target_subarch%': '<(target_subarch)',
       'toolkit_views%': '<(toolkit_views)',
-      'toolkit_uses_gtk%': '<(toolkit_uses_gtk)',
       'desktop_linux%': '<(desktop_linux)',
       'use_aura%': '<(use_aura)',
       'use_ash%': '<(use_ash)',
       'use_cras%': '<(use_cras)',
       'use_ozone%': '<(use_ozone)',
       'use_ozone_evdev%': '<(use_ozone_evdev)',
       'use_clipboard_aurax11%': '<(use_clipboard_aurax11)',
       'embedded%': '<(embedded)',
       'use_openssl%': '<(use_openssl)',
       'use_openssl_certs%': '<(use_openssl_certs)',
@@ skipping 358 matching lines @@
         # A flag to enable or disable our compile-time dependency
         # on gnome-keyring. If that dependency is disabled, no gnome-keyring
         # support will be available. This option is useful
         # for Linux distributions and for Aura.
         ['OS!="linux" or chromeos==1', {
           'use_gnome_keyring%': 0,
         }, {
           'use_gnome_keyring%': 1,
         }],
 
-        ['toolkit_uses_gtk==1 or OS=="mac" or OS=="ios"', {
-          # GTK+, Mac and iOS want Title Case strings
+        ['OS=="mac" or OS=="ios"', {
+          # Mac and iOS want Title Case strings
           'use_titlecase_in_grd_files%': 1,
         }],
 
         # Enable loader extensions on Chrome OS.
         ['chromeos==1', {
           'image_loader_extension%': 1,
         }, {
           'image_loader_extension%': 0,
         }],
 
@@ skipping 300 matching lines @@
     'os_bsd%': '<(os_bsd)',
     'os_posix%': '<(os_posix)',
     'use_dbus%': '<(use_dbus)',
     'use_glib%': '<(use_glib)',
     'use_pango%': '<(use_pango)',
     'use_cairo%': '<(use_cairo)',
     'use_ozone%': '<(use_ozone)',
     'use_ozone_evdev%': '<(use_ozone_evdev)',
     'use_clipboard_aurax11%': '<(use_clipboard_aurax11)',
     'use_system_fontconfig%': '<(use_system_fontconfig)',
-    'toolkit_uses_gtk%': '<(toolkit_uses_gtk)',
     'desktop_linux%': '<(desktop_linux)',
     'use_x11%': '<(use_x11)',
     'use_gnome_keyring%': '<(use_gnome_keyring)',
     'linux_fpic%': '<(linux_fpic)',
     'chromeos%': '<(chromeos)',
     'enable_viewport%': '<(enable_viewport)',
     'enable_hidpi%': '<(enable_hidpi)',
     'use_xi2_mt%':'<(use_xi2_mt)',
     'image_loader_extension%': '<(image_loader_extension)',
     'fastbuild%': '<(fastbuild)',
@@ skipping 851 matching lines @@
       }],
       ['chromeos==1', {
         'grit_defines': ['-D', 'chromeos', '-D', 'scale_factors=2x'],
       }],
       ['desktop_linux==1', {
         'grit_defines': ['-D', 'desktop_linux'],
       }],
       ['toolkit_views==1', {
         'grit_defines': ['-D', 'toolkit_views'],
       }],
-      ['toolkit_uses_gtk==1', {
-        'grit_defines': ['-D', 'toolkit_uses_gtk'],
-      }],
       ['use_aura==1', {
         'grit_defines': ['-D', 'use_aura'],
       }],
       ['use_ash==1', {
         'grit_defines': ['-D', 'use_ash'],
       }],
       ['use_nss==1', {
         'grit_defines': ['-D', 'use_nss'],
       }],
       ['use_ozone==1', {
@@ skipping 483 matching lines @@
       }],
       ['use_x11==1', {
         'defines': ['USE_X11=1'],
       }],
       ['use_clipboard_aurax11==1', {
         'defines': ['USE_CLIPBOARD_AURAX11=1'],
       }],
       ['enable_one_click_signin==1', {
         'defines': ['ENABLE_ONE_CLICK_SIGNIN'],
       }],
-      ['toolkit_uses_gtk==1 and toolkit_views==0', {
-        # TODO(erg): We are progressively sealing up use of deprecated features
-        # in gtk in preparation for an eventual porting to gtk3.
-        'defines': ['GTK_DISABLE_SINGLE_INCLUDES=1'],
-      }],
       ['chromeos==1', {
         'defines': ['OS_CHROMEOS=1'],
       }],
       ['use_xi2_mt!=0 and use_x11==1', {
         'defines': ['USE_XI2_MT=<(use_xi2_mt)'],
       }],
       ['image_loader_extension==1', {
         'defines': ['IMAGE_LOADER_EXTENSION=1'],
       }],
       ['profiling==1', {
@@ skipping 2904 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }